Celebrity reactions to the incredible loss of Joan Rivers on social media.

Joan Rivers' friends, colleagues, and fans across the world are mourning the enormous loss of the beloved and iconic comedienne. Rivers held a place in the hearts of fans who laughed alongside her, worked with her, or had the chance to meet her. Read on to catch the reactions of her Fashion Police co-stars and other celebrity friends who have been sharing memories and condolences via social media.

Her E! family dedicated their Thursday night news program to Joan and released the following statement from Giuliana Rancic, Fashion Police co-star and cherished friend.

"It is impossible to describe how much I adored Joan and how much she has meant to me. She was not only the funniest women I have ever met but was incredibly loving, honest, and lived her life with no regrets. Working with her for the last 13 years has been one of the true joys of my life. She could put a smile on your face, instantly, no matter how hard your day was. My heart goes out to Melissa and Cooper who have lost something that can never be replaced. Their bond was truly one-of-a-kind. They had the greatest mother and grandmother anyone could ever hope for.

My life is so much fuller and happier because I got to share it with this beautiful person, a true genius. I woke up today unable to grasp what the world will be like without her and at the same time, feel so privileged to have called her my friend. Until we meet again...May you rest in peace, Joan. I love you."

Kelly Osbourne looked at Joan as her second mother.

"I'm completely heartbroken by the loss of my beloved Joan. Not only was she my boss, she was and will always be my teacher, therapist, closest friend, inspiration and the only grandmother I ever knew. She was family and I will never forget her. Laughter will be difficult for a while but when I'm sad, lonely or upset all I will have to do is think of Joan and a smile will cross my face. Laughter is what she gave us and laughter is what she would want us to do in remembrance of her. Melissa and Cooper, my thoughts are with you and I love you both so much. Joan, thank you for taking me in and loving me as a daughter. I will miss you deeply and will always hear your voice in my head saying ‘my darling get out there and be you!'"

And finally, George Kotsiopoulos who had the honor of sitting next to Joan in every episode, "Rest in peace Joan Rivers. Thank you for changing my life. I will miss you so much."

Celebrity Reactions to Joan River's Death

May you rest in peace Joan Rivers. Your uniqueness and your gift of laughter will permeate the heavens. You will never be forgotten.